Psycho-Physiological Responses to Repeated-Sprint Training in Normobaric Hypoxia and Normoxia

Abstract : PURPOSE: We compared psycho-physiological responses to six repeated-sprint sessions in normobaric hypoxia (RSH) and normoxia (RSN) in team-sport athletes during a 2-wk ‘live high-train low’ training camp. METHODS: While residing under normobaric hypoxia (≥14 h.d-1; FiO2 14.5-14.2%), twenty-three lowland elite field hockey players performed, in addition to their usual training, six sessions (4 × 5 × 5-s maximal sprints; 25 s passive recovery; 5 min rest) under either normobaric hypoxia (FiO2 ~14.5%) or normoxia (FiO2 21%). Sprint 1 and 5 times, physiological strain [heart rate (HR), arterial oxyhemoglobin saturation (SpO2)] and perceptual responses (overall peripheral discomfort, difficulty breathing and lower-limb discomfort) were monitored. RESULTS: During the first session, HR increased across sets (P<0.001), independently of the conditions while SpO2 was globally lower (P<0.001) for RSH (averaged value: 91.9±1.2%) vs. RSN (96.9±0.6%). Thereafter, SpO2 and HR remained similar across sessions for each condition. While first sprint time remained similar, last sprint time and fatigue index significantly decreased across sets (P<0.01) and sessions (P<0.05) but not between conditions. Ratings of overall perceived discomfort, difficulty breathing and lower-limb discomfort were higher (P<0.05) in RSH vs. RSN at the first session. During subsequent sessions, overall perceived discomfort (time (P<0.001) and condition (P<0.05) effects), difficulty breathing (time effect; P<0.001) and lower-limb discomfort (condition (P<0.001) and interaction (P<0.05) effects) values decreased to a larger extent in RSH vs. RSN. CONCLUSION: Despite higher hypoxia-induced physiological and perceptual strain during the first session, perceptual responses improved thereafter in RSH so as not to differ from RSN. This indicates an effective ‘acclimation’ and tolerance to this innovative training.
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International Journal of Sports Physiology and Performance, Human Kinetics, 2016, 12 (1), pp.115-123. 〈10.1123/ijspp.2016-0052〉
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Franck Brocherie, Olivier Girard, Grégoire P. Millet. Psycho-Physiological Responses to Repeated-Sprint Training in Normobaric Hypoxia and Normoxia. International Journal of Sports Physiology and Performance, Human Kinetics, 2016, 12 (1), pp.115-123. 〈10.1123/ijspp.2016-0052〉. 〈hal-01491040〉

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